Add config for exclude, client ID, version
Add config for exclude, client ID, version

- 'exclude' option to prevent addon from inserting the google maps API script tag
- 'version' option to specify a version of the google maps API
- 'client' option to use a Client ID instead of a key (for Google Maps API Premium Plan users)
asennikov/ember-g-map,asennikov/ember-g-map